Experimental Study of Pool Boiling on Heaters with Nanomodified Surfaces under Saturation

Abstract

A technology has been developed for the synthesis of arrays of oriented microropes and cocoon-like microstructures consisting of silicon oxide nanowires on a copper substrate with barrier layers of silicon dioxide, molybdenum, and tungsten. In experiments, a copper surface coated with a tungsten layer showed the best stability and technological applicability. Experiments were performed to study pool boiling heat transfer on copper heaters with nanomodified surfaces under saturation conditions. A comparison of the data on heat transfer enhancement on smooth and nanomodified hydrophilic and hydrophobic copper surfaces was made. Relatively high heat transfer coefficients were observed on copper surfaces with a tungsten barrier layer initially coated with microropes and micrococoons. The experiments showed that microropes from nanowires were not resistant to boiling; micrococoons from nanowires were more stable. Superhydrophobic surfaces were produced by hot-wire chemical vapor deposition (HWCVD) of fluoropolymer coatings on micrococoons. In the boiling experiments, the greatest heat transfer enhancement was obtained on such surfaces. The fluoropolymer coating was shown to lose its continuity. As a result, a random biphilic coating was formed and intense bubble boiling occurred in local hydrophobic areas of the fluoropolymer, resulting in heat transfer enhancement.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The study of coatings deposition and nanostructures synthesis was carried out under state contract under state contract No.121031800213-0, the study of heat transfer was financially supported by Russian Science Foundation (Project No. 18-19-00407).

Notes on contributors

Sergey Khmel

Sergey Khmel is a Senior Researcher at Kutateladze Institute of Thermophysics, Siberian Branch of Russian Academy of Science, Novosibirsk. He received his M.S. at Novosibirsk State University and Ph.D. at Kutateladze Institute of Thermophysics. His research activities cover supersonic free jets, cluster formation, electron-beam plasma, PECVD, silicon-containing films and nanowires, functionalization of nanowires, nanomodification surfaces for intensification of heat transfer. He has published more than 60 papers.

Evgeniy Baranov

Evgeniy Baranov is a Senior Researcher at Kutateladze Institute of Thermophysics, Siberian Branch of Russian Academy of Science, Novosibirsk. He received his M.S. at Novosibirsk State University and Ph.D. at Kutateladze Institute of Thermophysics. His research activities cover thin film deposition, plasma, plasma diagnostics, material characterization, silicon, nanowires, and solar cell. He has published 33 papers.

Victor Vladimirov

Viktor Vladimirov is an Engineer of Laboratory of Heat Transfer Enhancement and postgraduate student of Institute of Thermophysics SB RAS. He received his M.S. at Novosibirsk State University. His research activities cover heat transfer boiling and biphilic surfaces. He has published 3 papers.

Alexey Safonov

Alexey Safonov is a Senior Researcher at Kutateladze Institute of Thermophysics, Siberian Branch of Russian Academy of Science, Novosibirsk. He received his doctoral degree in 2011 from Institute of Thermophysics, Russia; Master of Science in 2006 and Bachelor degree in 2004 from Novosibirsk State Technical University, Russia. His current research interests include research of synthesis and deposition processes of micro- /nano-structured metal and fluoropolymer coatings for different applications. He has published more than 45 papers.

Evgeny Chinnov

Evgeny Chinnov is Chief Researcher of Laboratory of Heat Transfer Enhancement, Institute of Thermophysics SB RAS. He graduated from the Novosibirsk State University in Russia and received the Ph.D. degree (Physics and Mathematics) from the Institute of Thermophysics. He received the degree of Doctor of Sciences in Physics and Mathematics (habilitation) from the same institute. His research interests are heat transfer with phase transitions and two-phase flows; heat transfer and crisis phenomenon in falling liquid films; enhancement of heat transfer in bubbling, boiling, condensing, and cryogenic systems. He is a member of the National Committee for Heat and Mass Transfer of the Russian Academy of Sciences. He is author and coauthor of more than 200 papers.